--- a/devtools/client/inspector/animation-old/test/head.js
+++ b/devtools/client/inspector/animation-old/test/head.js
@@ -38,16 +38,17 @@ registerCleanupFunction(() => {
 // Some animation features are not enabled by default in release/beta channels
 // yet including:
 // * parts of the Web Animations API (Bug 1264101), and
 // * the frames() timing function (Bug 1379582).
 function enableAnimationFeatures() {
   return new Promise(resolve => {
     SpecialPowers.pushPrefEnv({"set": [
       ["dom.animations-api.core.enabled", true],
+      ["dom.animations-api.getAnimations.enabled", true],
       ["dom.animations-api.implicit-keyframes.enabled", true],
       ["dom.animations-api.timelines.enabled", true],
       ["layout.css.frames-timing.enabled", true],
     ]}, resolve);
   });
 }
 
 /**

--- a/devtools/client/inspector/animation/test/head.js
+++ b/devtools/client/inspector/animation/test/head.js
@@ -56,16 +56,17 @@ const closeAnimationInspector = async fu
  * yet including:
  *   * parts of the Web Animations API (Bug 1264101), and
  *   * the frames() timing function (Bug 1379582).
  */
 const enableAnimationFeatures = function() {
   return new Promise(resolve => {
     SpecialPowers.pushPrefEnv({"set": [
       ["dom.animations-api.core.enabled", true],
+      ["dom.animations-api.getAnimations.enabled", true],
       ["dom.animations-api.implicit-keyframes.enabled", true],
       ["dom.animations-api.timelines.enabled", true],
       ["layout.css.frames-timing.enabled", true],
     ]}, resolve);
   });
 };
 
 /**

--- a/dom/animation/test/crashtests/crashtests.list
+++ b/dom/animation/test/crashtests/crashtests.list
@@ -9,27 +9,27 @@ pref(dom.animations-api.core.enabled,tru
 load 1272475-1.html
 load 1272475-2.html
 load 1278485-1.html
 pref(dom.animations-api.timelines.enabled,true) load 1277272-1.html
 load 1282691-1.html
 pref(dom.animations-api.core.enabled,true) load 1291413-1.html
 pref(dom.animations-api.core.enabled,true) load 1291413-2.html
 pref(dom.animations-api.compositing.enabled,true) load 1304886-1.html
-pref(dom.animations-api.core.enabled,true) load 1309198-1.html
+pref(dom.animations-api.getAnimations.enabled,true) load 1309198-1.html
 pref(dom.animations-api.implicit-keyframes.enabled,true) load 1322382-1.html
 pref(dom.animations-api.core.enabled,true) pref(dom.animations-api.implicit-keyframes.enabled,true) load 1322291-1.html
 pref(dom.animations-api.core.enabled,true) pref(dom.animations-api.implicit-keyframes.enabled,true) load 1322291-2.html
 pref(dom.animations-api.implicit-keyframes.enabled,true) pref(dom.animations-api.compositing.enabled,true) load 1323114-1.html
 pref(dom.animations-api.compositing.enabled,true) load 1323114-2.html
 pref(dom.animations-api.implicit-keyframes.enabled,true) load 1323119-1.html
 pref(dom.animations-api.implicit-keyframes.enabled,true) load 1324554-1.html
 pref(dom.animations-api.implicit-keyframes.enabled,true) pref(dom.animations-api.compositing.enabled,true) load 1325193-1.html
 pref(dom.animations-api.implicit-keyframes.enabled,true) load 1330190-1.html
-pref(dom.animations-api.core.enabled,true) pref(dom.animations-api.implicit-keyframes.enabled,true) pref(dom.animations-api.compositing.enabled,true) load 1330190-2.html
+pref(dom.animations-api.core.enabled,true) pref(dom.animations-api.implicit-keyframes.enabled,true) pref(dom.animations-api.compositing.enabled,true) pref(dom.animations-api.getAnimations.enabled,true) load 1330190-2.html
 pref(dom.animations-api.implicit-keyframes.enabled,true) pref(dom.animations-api.compositing.enabled,true) load 1330513-1.html
 pref(dom.animations-api.core.enabled,true) pref(dom.animations-api.timelines.enabled,true) load 1333539-1.html
 pref(dom.animations-api.core.enabled,true) pref(dom.animations-api.timelines.enabled,true) load 1333539-2.html
 load 1334582-1.html
 load 1334582-2.html
 load 1334583-1.html
 pref(dom.animations-api.core.enabled,true) pref(dom.animations-api.compositing.enabled,true) load 1335998-1.html
 pref(dom.animations-api.core.enabled,true) load 1343589-1.html

--- a/dom/animation/test/mochitest.ini
+++ b/dom/animation/test/mochitest.ini
@@ -1,21 +1,23 @@
 [DEFAULT]
 prefs =
   dom.animations-api.compositing.enabled=true
   dom.animations-api.core.enabled=true
+  dom.animations-api.getAnimations.enabled=true
   dom.animations-api.implicit-keyframes.enabled=true
   dom.animations-api.timelines.enabled=true
 # Support files for chrome tests that we want to load over HTTP need
 # to go in here, not chrome.ini.
 support-files =
   chrome/file_animate_xrays.html
   mozilla/xhr_doc.html
   mozilla/file_deferred_start.html
   mozilla/file_disable_animations_api_compositing.html
+  mozilla/file_disable_animations_api_get_animations.html
   mozilla/file_disable_animations_api_implicit_keyframes.html
   mozilla/file_disable_animations_api_timelines.html
   mozilla/file_discrete_animations.html
   mozilla/file_restyles.html
   mozilla/file_transition_finish_on_compositor.html
   ../../../layout/style/test/property_database.js
   testcommon.js
   !/dom/events/test/event_leak_utils.js
@@ -38,16 +40,17 @@ support-files =
 [document-timeline/test_document-timeline.html]
 skip-if = (verify && !debug && (os == 'mac'))
 [document-timeline/test_request_animation_frame.html]
 [mozilla/test_cascade.html]
 [mozilla/test_cubic_bezier_limits.html]
 [mozilla/test_deferred_start.html]
 skip-if = (toolkit == 'android' && debug) || (os == 'win' && bits == 64) # Bug 1363957
 [mozilla/test_disable_animations_api_compositing.html]
+[mozilla/test_disable_animations_api_get_animations.html]
 [mozilla/test_disable_animations_api_implicit_keyframes.html]
 [mozilla/test_disable_animations_api_timelines.html]
 [mozilla/test_disabled_properties.html]
 [mozilla/test_discrete_animations.html]
 [mozilla/test_distance_of_basic_shape.html]
 [mozilla/test_distance_of_filter.html]
 [mozilla/test_distance_of_transform.html]
 [mozilla/test_document_timeline_origin_time_range.html]

new file mode 100644
--- /dev/null
+++ b/dom/animation/test/mozilla/file_disable_animations_api_get_animations.html
@@ -0,0 +1,25 @@
+<!doctype html>
+<meta charset=utf-8>
+<script src="../testcommon.js"></script>
+<body>
+<script>
+'use strict';
+
+test(t => {
+  assert_false('getAnimations' in addDiv(t));
+}, 'Element.getAnimations() is not available when getAnimations pref is'
+    + ' disabled');
+
+test(t => {
+  assert_false('getAnimations' in document);
+}, 'Document.getAnimations() is not available when getAnimations pref is'
+    + ' disabled');
+
+test(t => {
+  assert_false('CSSPseudoElement' in window);
+}, 'CSSPseudoElement interface is not available when getAnimations pref is'
+    + ' disabled');
+
+done();
+</script>
+</body>

--- a/dom/animation/test/mozilla/test_deferred_start.html
+++ b/dom/animation/test/mozilla/test_deferred_start.html
@@ -5,16 +5,17 @@
 <div id="log"></div>
 <script>
 'use strict';
 setup({explicit_done: true});
 SpecialPowers.pushPrefEnv(
   {
     set: [
       ["dom.animations-api.core.enabled", true],
+      ["dom.animations-api.getAnimations.enabled", true],
       ["dom.animations-api.timelines.enabled", true],
     ],
   },
   function() {
     window.open("file_deferred_start.html");
   }
 );
 </script>

new file mode 100644
--- /dev/null
+++ b/dom/animation/test/mozilla/test_disable_animations_api_get_animations.html
@@ -0,0 +1,14 @@
+<!doctype html>
+<meta charset=utf-8>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+'use strict';
+setup({explicit_done: true});
+SpecialPowers.pushPrefEnv(
+  { "set": [["dom.animations-api.getAnimations.enabled", false]]},
+  function() {
+    window.open("file_disable_animations_api_get_animations.html");
+  });
+</script>

--- a/dom/base/nsDocument.cpp
+++ b/dom/base/nsDocument.cpp
@@ -3303,16 +3303,27 @@ nsDocument::IsWebAnimationsEnabled(Calle
 {
   MOZ_ASSERT(NS_IsMainThread());
 
   return aCallerType == dom::CallerType::System ||
          nsContentUtils::AnimationsAPICoreEnabled();
 }
 
 bool
+nsDocument::IsWebAnimationsGetAnimationsEnabled(JSContext* aCx,
+                                                JSObject* /*unused*/
+)
+{
+  MOZ_ASSERT(NS_IsMainThread());
+
+  return nsContentUtils::IsSystemCaller(aCx) ||
+         StaticPrefs::dom_animations_api_getAnimations_enabled();
+}
+
+bool
 nsDocument::AreWebAnimationsImplicitKeyframesEnabled(JSContext* aCx,
                                                      JSObject* /*unused*/
 )
 {
   MOZ_ASSERT(NS_IsMainThread());
 
   return nsContentUtils::IsSystemCaller(aCx) ||
          StaticPrefs::dom_animations_api_implicit_keyframes_enabled();

--- a/dom/base/nsDocument.h
+++ b/dom/base/nsDocument.h
@@ -155,16 +155,18 @@ public:
                                      nsIStreamListener **aDocListener,
                                      bool aReset = true,
                                      nsIContentSink* aContentSink = nullptr) override = 0;
 
   virtual void StopDocumentLoad() override;
 
   static bool IsWebAnimationsEnabled(JSContext* aCx, JSObject* aObject);
   static bool IsWebAnimationsEnabled(mozilla::dom::CallerType aCallerType);
+  static bool IsWebAnimationsGetAnimationsEnabled(JSContext* aCx,
+                                                  JSObject* aObject);
   static bool AreWebAnimationsImplicitKeyframesEnabled(JSContext* aCx,
                                                        JSObject* aObject);
   static bool AreWebAnimationsTimelinesEnabled(JSContext* aCx,
                                                JSObject* aObject);
 
   virtual void EndUpdate() override;
   virtual void BeginLoad() override;
   virtual void EndLoad() override;

--- a/dom/base/test/test_bug1295852.html
+++ b/dom/base/test/test_bug1295852.html
@@ -5,17 +5,17 @@
 <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css">
 <body>
 <script>
 
 var names = [
   "span", "_moz_generated_content_before", "_moz_generated_content_after"
 ];
 
-if (SpecialPowers.getBoolPref("dom.animations-api.core.enabled")) {
+if (SpecialPowers.getBoolPref("dom.animations-api.getAnimations.enabled")) {
   names.forEach(name => {
     var element = document.createElement(name);
     element.animate({ "color": ["red", "blue"] }, { duration: 1000 });
     is(element.getAnimations().length, 1);
   });
 } else {
   ok("Test requires Web Animations, which is disabled.");
 }

--- a/dom/base/test/test_domwindowutils.html
+++ b/dom/base/test/test_domwindowutils.html
@@ -52,17 +52,22 @@ function test_sendMouseEventOptionals() 
 
   // Check explicit value for optional args
   utils.sendMouseEvent("mouseup", x, y, button, clickCount, modifiers,
                        false, pressure, source, false);
 }
 
 function test_getUnanimatedComputedStyle() {
   SpecialPowers.pushPrefEnv(
-    { set: [["dom.animations-api.core.enabled", true]] },
+    {
+      set: [
+        ["dom.animations-api.core.enabled", true],
+        ["dom.animations-api.getAnimations.enabled", true],
+      ],
+    },
     () => {
       window.open("file_domwindowutils_animation.html");
     }
   );
 }
 
 var tests = [
   test_sendMouseEventDefaults,

--- a/dom/smil/test/test_smilWithTransition.html
+++ b/dom/smil/test/test_smilWithTransition.html
@@ -5,14 +5,14 @@
   <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
 </head>
 <pre id="test">
 <script>
 'use strict';
 
 SimpleTest.waitForExplicitFinish();
 SpecialPowers.pushPrefEnv(
-  { "set": [["dom.animations-api.core.enabled", true]]},
+  { "set": [["dom.animations-api.getAnimations.enabled", true]]},
   function() {
     window.open("file_smilWithTransition.html");
   });
 </script>
 </html>

--- a/dom/webidl/Animatable.webidl
+++ b/dom/webidl/Animatable.webidl
@@ -18,11 +18,11 @@ dictionary AnimationFilter {
   boolean subtree = false;
 };
 
 [NoInterfaceObject]
 interface Animatable {
   [Throws]
   Animation animate(object? keyframes,
                     optional UnrestrictedDoubleOrKeyframeAnimationOptions options);
-  [Func="nsDocument::IsWebAnimationsEnabled"]
+  [Func="nsDocument::IsWebAnimationsGetAnimationsEnabled"]
   sequence<Animation> getAnimations(optional AnimationFilter filter);
 };

--- a/dom/webidl/CSSPseudoElement.webidl
+++ b/dom/webidl/CSSPseudoElement.webidl
@@ -10,16 +10,16 @@
  * Copyright © 2015 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
  * liability, trademark and document use rules apply.
  */
 
 // Both CSSOM and CSS Pseudo-Elements 4 provide contradictory definitions for
 // this interface.
 // What we implement here is a minimal subset of the two definitions which we
 // ship behind a pref until the specification issues have been resolved.
-[Func="nsDocument::IsWebAnimationsEnabled"]
+[Func="nsDocument::IsWebAnimationsGetAnimationsEnabled"]
 interface CSSPseudoElement {
   readonly attribute DOMString type;
   readonly attribute Element parentElement;
 };
 
 // https://drafts.csswg.org/web-animations/#extensions-to-the-pseudoelement-interface
 CSSPseudoElement implements Animatable;

--- a/dom/webidl/Document.webidl
+++ b/dom/webidl/Document.webidl
@@ -320,17 +320,17 @@ partial interface Document {
   //(Not implemented)Element?  find(DOMString selectors, optional (Element or sequence<Node>)? refNodes);
   //(Not implemented)NodeList  findAll(DOMString selectors, optional (Element or sequence<Node>)? refNodes);
 };
 
 // https://drafts.csswg.org/web-animations/#extensions-to-the-document-interface
 partial interface Document {
   [Func="nsDocument::AreWebAnimationsTimelinesEnabled"]
   readonly attribute DocumentTimeline timeline;
-  [Func="nsDocument::IsWebAnimationsEnabled"]
+  [Func="nsDocument::IsWebAnimationsGetAnimationsEnabled"]
   sequence<Animation> getAnimations();
 };
 
 // https://svgwg.org/svg2-draft/struct.html#InterfaceDocumentExtensions
 partial interface Document {
   [BinaryName="SVGRootElement"]
   readonly attribute SVGSVGElement? rootElement;
 };

--- a/layout/style/crashtests/crashtests.list
+++ b/layout/style/crashtests/crashtests.list
@@ -124,17 +124,17 @@ load 1066089-1.html
 load 1074651-1.html
 load 1135534.html
 pref(dom.webcomponents.shadowdom.enabled,true) load 1089463-1.html
 load 1136010-1.html
 load 1146101-1.html
 load 1153693-1.html
 load 1156969.svg
 load 1161320-1.html
-pref(dom.animations-api.core.enabled,true) load 1161320-2.html
+pref(dom.animations-api.getAnimations.enabled,true) load 1161320-2.html
 load 1161366-1.html
 load 1163446-1.html
 load 1164813-1.html
 load 1167782-1.html
 load 1186768-1.xhtml
 load 1200568-1.html
 load 1206105-1.html
 load 1223688-1.html
@@ -154,17 +154,17 @@ load 1250791.html
 load 1264396-1.html
 load 1264949.html
 # The following test relies on -webkit-text-fill-color being behind the
 # layout.css.prefixes.webkit pref
 pref(layout.css.prefixes.webkit,false) load 1265611-1.html
 load 1270795.html
 load 1275026.html
 load 1278463-1.html
-pref(dom.animations-api.core.enabled,true) load 1277908-1.html # bug 1323652
+pref(dom.animations-api.getAnimations.enabled,true) load 1277908-1.html
 load 1277908-2.html
 load 1282076-1.html
 load 1282076-2.html
 load 1290994-1.html
 load 1290994-2.html
 load 1290994-3.html
 load 1290994-4.html
 load 1314531.html
@@ -270,17 +270,17 @@ load 1410226-2.html
 load 1411008.html
 load 1411143.html
 load 1411478.html
 load 1413288.html
 load 1413361.html
 load 1413670.html
 pref(dom.webcomponents.shadowdom.enabled,true) load 1415353.html
 load 1418059.html
-test-pref(dom.animations-api.core.enabled,true) test-pref(dom.animations-api.implicit-keyframes.enabled,true) load 1418867.html
+test-pref(dom.animations-api.core.enabled,true) test-pref(dom.animations-api.implicit-keyframes.enabled,true) pref(dom.animations-api.getAnimations.enabled,true) load 1418867.html
 pref(dom.webcomponents.shadowdom.enabled,true) load 1419554.html
 load 1426312.html
 load 1439793.html
 load 1409183.html
 pref(dom.webcomponents.shadowdom.enabled,true) load 1445682.html
 pref(dom.webcomponents.shadowdom.enabled,true) load 1449243.html
 load 1450691.html
 pref(dom.webcomponents.shadowdom.enabled,true) load 1453206.html

--- a/layout/style/test/mochitest.ini
+++ b/layout/style/test/mochitest.ini
@@ -1,12 +1,13 @@
 [DEFAULT]
 prefs =
   dom.animations-api.compositing.enabled=true
   dom.animations-api.core.enabled=true
+  dom.animations-api.getAnimations.enabled=true
   dom.animations-api.implicit-keyframes.enabled=true
   dom.animations-api.timelines.enabled=true
 support-files =
   animation_utils.js
   ccd-quirks.html
   ccd.sjs
   ccd-standards.html
   chrome/bug418986-2.js

--- a/modules/libpref/init/StaticPrefList.h
+++ b/modules/libpref/init/StaticPrefList.h
@@ -99,16 +99,34 @@ VARCACHE_PREF(
 #endif
 VARCACHE_PREF(
   "dom.animations-api.compositing.enabled",
    dom_animations_api_compositing_enabled,
   bool, PREF_VALUE
 )
 #undef PREF_VALUE
 
+// Is support for Document.getAnimations() and Element.getAnimations()
+// supported?
+//
+// Before enabling this by default, make sure also CSSPseudoElement interface
+// has been spec'ed properly, or we should add a separate pref for
+// CSSPseudoElement interface. See Bug 1174575 for further details.
+#ifdef RELEASE_OR_BETA
+# define PREF_VALUE false
+#else
+# define PREF_VALUE true
+#endif
+VARCACHE_PREF(
+  "dom.animations-api.getAnimations.enabled",
+   dom_animations_api_getAnimations_enabled,
+  bool, PREF_VALUE
+)
+#undef PREF_VALUE
+
 // Is support for animations from the Web Animations API without 0%/100%
 // keyframes enabled?
 #ifdef RELEASE_OR_BETA
 # define PREF_VALUE false
 #else
 # define PREF_VALUE true
 #endif
 VARCACHE_PREF(

--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -3063,20 +3063,17 @@ pref("layout.idle_period.required_quiesc
 
 // The amount of time (milliseconds) needed between an idle period's
 // end and the start of the next tick to avoid jank.
 pref("layout.idle_period.time_limit", 1);
 
 // Whether -webkit-appearance is aliased to -moz-appearance
 pref("layout.css.webkit-appearance.enabled", false);
 
-// Is support for the Web Animations API enabled?
-// Before enabling this by default, make sure also CSSPseudoElement interface
-// has been spec'ed properly, or we should add a separate pref for
-// CSSPseudoElement interface. See Bug 1174575 for further details.
+// Is support for the core interfaces of Web Animations API enabled?
 #ifdef RELEASE_OR_BETA
 pref("dom.animations-api.core.enabled", false);
 #else
 pref("dom.animations-api.core.enabled", true);
 #endif
 
 // Pref to throttle offsreen animations
 pref("dom.animations.offscreen-throttling", true);

--- a/testing/web-platform/meta/css/css-animations/__dir__.ini
+++ b/testing/web-platform/meta/css/css-animations/__dir__.ini
@@ -1,4 +1,5 @@
 prefs: [dom.animations-api.compositing.enabled:true,
         dom.animations-api.core.enabled:true,
+        dom.animations-api.getAnimations.enabled:true,
         dom.animations-api.implicit-keyframes.enabled:true,
         dom.animations-api.timelines.enabled:true]

--- a/testing/web-platform/meta/css/css-scoping/__dir__.ini
+++ b/testing/web-platform/meta/css/css-scoping/__dir__.ini
@@ -1,1 +1,1 @@
-prefs: [dom.animations-api.core.enabled:true,dom.webcomponents.shadowdom.enabled:true]
+prefs: [dom.animations-api.getAnimations.enabled:true,dom.webcomponents.shadowdom.enabled:true]

--- a/testing/web-platform/meta/css/css-transitions/__dir__.ini
+++ b/testing/web-platform/meta/css/css-transitions/__dir__.ini
@@ -1,4 +1,5 @@
 prefs: [dom.animations-api.compositing.enabled:true,
         dom.animations-api.core.enabled:true,
+        dom.animations-api.getAnimations.enabled:true,
         dom.animations-api.implicit-keyframes.enabled:true,
         dom.animations-api.timelines.enabled:true]

--- a/testing/web-platform/meta/web-animations/__dir__.ini
+++ b/testing/web-platform/meta/web-animations/__dir__.ini
@@ -1,5 +1,6 @@
 prefs: [dom.animations-api.compositing.enabled:true,
         dom.animations-api.core.enabled:true,
+        dom.animations-api.getAnimations.enabled:true,
         dom.animations-api.implicit-keyframes.enabled:true,
         dom.animations-api.timelines.enabled:true,
         layout.css.frames-timing.enabled:true]